package zuoye;

public class zuoye4 {
public static void main(String[] args){
	double x=0;
	for(int i=1;;i++){
		x=x+2.5;
		if(i%5==0){
			x=x-6;
		}
		if(x>=100){
			System.out.println(i);
			break;
		}
	}
}
}